Abstract:
To improve the power factor and reliability for medium/high-power supply, a three-phase single-stage ac-dc converter based on magnetic-combination transformer with power ...Show MoreMetadata
Abstract:
To improve the power factor and reliability for medium/high-power supply, a three-phase single-stage ac-dc converter based on magnetic-combination transformer with power factor correction (PFC) function is presented in this paper. According to the three-phase instantaneous power balance principle and the concept of the magnetic-flux superposition, a novel magnetic-combination transformer is proposed, which can make three-phase symmetrically and sinusoidally fluctuant power add to be constant. Therefore, the induced voltage of the secondary winding is constant. To realize sinusoidally fluctuant power in the input stage, dc-link filter capacitance can be reduced to a several-microfarad level. Single-stage PFC function, no electrolytic capacitor, and constant output voltage can be realized in the converter. The principle and the structure of the novel magnetic-combination transformer are analyzed in detail in this paper. Simulation and experimental results are presented to verify the feasibility of the proposed converter.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 63, Issue: 12, December 2016)